gnome-classic-fallback and NVIDIA multi X session problem; seven X session on ONE display!

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Hi!
I tried with nvidia-settigs and a separated monitor (apart from laptop) to enable the "Separate X Screen". I had no problems with the TwinView, before. When I first enabled the Separate X Screen, one monitor went blank, and the other had two X session in the gnome panel. This could be a bug, but when I try to revert to TwinView mode (or also, with only one monitor) the second X session doesn't disappear! After some attempts I will find myself with seven X session on the same monitor!
I tried to purge and reinstall gnome-session-fallback, I tried to revert the xorg.conf file with the nvidia-settings and nvidia-xconfig ... with no luck at all.

You can find a screenshot at the end of the post.

This is my xorg.conf file:

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 304.88 (pbuilder@cake) Wed Apr 3 08:58:25 UTC 2013

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "AU Optronics Corporation"
HorizSync 36.0 - 54.0
VertRefresh 39.0 - 60.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "NVS 3100M"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-3"
Option "metamodes" "DFP: nvidia-auto-select +0+0, CRT: nvidia-auto-select +1440+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection

OK, I solved by reset GNOME3

Xavier_McHot's picture

OK, I solved by reset GNOME3 configurations of current user to default by

rm -rf .gnome .gnome2 .gconf .gconfd .metacity .cache .dbus .dmrc .mission-control .thumbnails ~/.config/dconf/user ~.compiz*

and log-in again.